Motor driven headstock for machine tools



Oct. 5, 19337. A. w. wlGGLEsWoRTH `2,095,089

MOTOR DRIVEN HEADSTOCK FOR MACHINE TOOLS Filed Feb. 3, 1936 2 Sheets-Sheet 1 Oct. 5, 19377 A. WIGGLESWORTH 2,095,089

MOTOR DRIVEN HEADSTOCK FOR MACHINE TOOLS Filed Feb. 5, 193e 2 sheets-Sheet4 2 ZO Z9 0 Patented Oct. 5, 1937 MOTOR DRIVEN HEADSTOCK FOR MACHINE TOOLS Y Albert W. Wigglesworth, Chicago, Ill., assignor to v Hill-Clarke Machinery Co., Chicago, Ill., a cor--v poration of Illinois Application February 3, 1936, Serial No. 62,079

5 Claims. (Cl. 51-2S7) This invention relates to machine. tools and particularly to a motor driven headstock for grinding machines. Such machines comprise a longitudinally reciprocable work carriage on which the headstock and tailstock, i. e. the work supporting and rotating mechanism are carried, for moving the work past a grinding tool located in juxtaposition to the carriage. n

The main object of the invention is to produce a self-contained enclosed headstock unit provided with variable speed, motor actuated driving means and mounted on the work carriage to travel with the carriage. v

Another object is to provide means for adjusting the tension of the belt which transmits power from the motor shaft to the drive mechanism without shifting of the motor. f

Another object is to provide manually actuated means for varying the speed of rotation of the head stock center, which means may be actuated while the motor is in operation.

In the drawings:

Fig. 1 is a front elevation of part of a grinding machine embodying my improved headstock.

Fig. 2 is a rear elevation of the same.

Fig. 3 is a sectional View taken on the line 3 3 n part I2 of the housing, and a two-piece upper housing I5. In the upper housing I5 are mounted a motor I6, pulley supporting frame I'I, and grooved pulley I8 and plain wide pulley I!!V on a shaft 23. The motor I5 is fixedly mounted on the floor 2| which partially closes the bottom of the housing I5. Spaced apart brackets 22 on the floor 2I support a horizontal shaft 23 on which is pivotally mounted the frame Il. The upwardly curved arms 24 of the frame I1 are apertured at their upper ends for the reception of the pulley shaft 20 rotatably mounted therein. The pulley I8 is fixed on one end of the shaft 2li and the wide pulley I9 is xed to said shaft between the arms 24 of the frame I1. One of the arms of the frame I1 is extended beyond the shaft 23 as indicated at 25 and is apertured to receive an adjusting screw 26. A depending lug 27 on said arm is apertured for the reception of an adjusting screw 28. The adjustment of the sc rews 26 and 28 in the end Z5 and lug 2l, respectively, with their ends bearing on the floor 2| of the housing, swings the frame il relatively to the shaft 23 and thus varies the position of the pulley I8 for the purpose of adjusting the tension of the belt 29. v v

The belt 29 on the pulley :it of the motor shaft transmits power from the motor I6 through pulley I8 to shaft 20. A belt 3i on the wide pulley I9 on said shaft 20 extends through the open bottom of the housing I5 .and transmits power to the drive shaft 32 through thei speedlchange pulley 33 on said shaft 32. The shaft 32 is operatively connected with the rotatable headstock center 34 through gearing (not shown) located in the lower housing member I3.

The speed change is accomplished by moving the belt 3l longitudinally of the wide pulley I9 and stepped or cone pulley S3. For this purpose I have provided a forked slide member 35 through which one lap ofthe belt 3! extends. The member 35 is slidably mounted on a shaft 35 in the housing I5, parallel with the pulley shaft 20, and has a handle 3l on its outer face and a pin 38 adapted to engage notches 39 ina bar liixed to the housing I5. By tilting'the slide member l35 it may be disengaged from one of the notches 39 in the bar 40 and be moved longitudinally of the bar to another notch.

In order to permit the belt 3l to be moved by actuation of the slidemember, it is necessary to relieve the belt 3l of tension and this is accomplished by pressing downwardly on a lever 42 rigidly connected to the part 43 of the housing I3`and arm 44, said housingV and arm being pivotally mounted on the shaft 45 which is in alignment with the center 34. The arm lliterminates in a bearing for the shaft 32. The downward actuation of the lever 42 and pivotal movement of the arm 44 (the latter being pivotally connected with shaft 32) raises the shaft 32 and the change-speed pulley 33 and relieves the belt 3I of tension, so that it may be moved on the pulleys I9 and 33 to Vary the speed of the shaft 32 which is geared to the center 34 to rotate it. When the lever 42 is released after adjustment of the belt 3| on pulleys I9 and 33, the pulley 33 with shaft 32 and associated housing I3 move by gravity to the position shown in Fig. 3 in which the belt 3| is under proper tension for operating purposes. The handle 46 is a locking device for preventing unintended movement of the lever 42, arm 44 and j r'fshaft'SZQand must be released before the lever lzfcanlbe depressed. i

Vj stock unit .Y protects Y YI have described the center 34 as a liveV center,

.rotatably connected With-the drive shaftr'32butVr obviouslyYV it may beqa dead center and'V have mounted 'on it a work driving plate` fixed'to a l gear 'rotatably mounted on the center or its spin- Vdle, ,the gear VbeingjdrivenY by thedrive shaft, 32,

g y An advantage 'of the fdescriloed'` constr'ution is the fact that the enclosed, self-'contained Vhead-1 the motor 'and driving. belt'V from Water.Y

K l V4'Changesmay be made in' y details :of construis;l\` tion Without Vdeparting from thescope of my in-- vention-,and I do not intendrtobe limitedxto the,

" exact'forrn ,shown and described, except as" set Vforthfin the appendedV claims.

lfAmotor driven'headstockforgrinding machines having ia longitudinally Vmovable Work f carriag`,'saidheadstockjcornprising a'motor, a.VV

motorshaft; a rotatable-'pulley shaft operative- IycnnQcted/iwith the motor'rj'shaft, af housing 425. mounted 'on' Y,the carriage and Vcontaining;said 'shaftrparallel'vvith the `pulley'shaft, speed'change \moto'r'-m'otlor shafLand jpulley shaft,` a drive "elements Von one :of said shafts, a belt connect- Ving said shafts, a'fvwork-engagingV member, Voperative .connections .between thedrive shaft and lworkengaging member, a vtvvo part 1 housing, Ymounted on the ca'rriage,v supporting the drive Y shaft YandV work-engaging member Yand enclos- Vf in'g-V Sai'df operative' connections @between them,V

andl'means onsaid two part housing for pivotalily moving part ofY the housing and therebybodily moving the; drive shaft to release tensionon said belt; f,

edin said` pivotalhsupports in a.v position lbeneath the pulley,fmeans Vfor actuating the pivotal sup-1 :ports to-jraise andrl'owe'r'said drive shafta-be1t`V Vconnecting Vthe pulley Yand the drive shaft, aV

A dinally Vreciprocable Workcarriage-and a head-Y Y Y -vyork engaging member, theY axis of which' is f parallel. with thekdire'ction of movement of the carriage, and operative connections between the drive shaft and the Workengaging member..

{37.A grinding machinefcomprisin'gqa longitustock unit mounted on the upper side offtherA Y Work carriage to travel Vwith the'carriage, said Y n headstock comprising ,a motor, a pulley opera-,

tively connected With the moto-r, a raised sup- Vport onthe 'carriage for the motor and pulley,

'a drive shaft, speed-change elements on the drive shaft, supports on'trheV carriage'in which the drive shaft is rotatably mounted, means VforV Y raising an'dlowering the drive shaft, arbelt con- Y ,Y

,lnecting said drive Ishaft and pulley, a work ,enfY

g'aging'memberV parallel Withthe driveishaft and@ 'F havingits' axis parallel` with the direction `offk movement of the carriageyand operative con-Y K nections betweenthe driveshaftzandwork en- 1-5 4'. QA motor drivenheadstock for grinding'ma- Y;

chin'esY having a rlongitudinally movable Work said shafts, a .work-engaging member, opera- ,'carriage, said headstockfcomprisingra motor, a Y

motor shaft, a rotatable pulley shaft opera- Y :tively connected with Ythe Vmotor shaft, a Yhousing-mounted on the carriage and containing YSaid rmo'tor, motor shaft Yandpulley shaft, a Vdrive` r yshaft parallelwith the pulley shaft, speed change elements on one ofsaid shafts, a belt connecting tive connections between' thexdrive shafty and l Work-engaging member,y a second housing, (mounted lon the carriage, supporting'the drive shaftl and Work-engagingk member andV enclos- Ving said*v operative connections Ybetween-them, L

anda belt-engaging memberrslidablyrmounted on the? first mentioned housing fo-r movingV theV V belt longitudinally of said pulleyrshaft and fdrive Shaft. J

,5. YA motor driven headstock Vfor grinding ma chines having a longitudinally'movable Work Y carriage, said headstock, comprising Ya motor, a Y motor shaft, a rotatable pulley shaft operative- -ly connected with the motorV shaft, Va housingY mounted on theicarriage and containing said motor, motor shaft and pulley shaft, Aa drive` shaft parallel with the pulley shaft, speed change'` VVV elements on;one of Vsaid shafts, a beltV connecting said shafts a Work-engaging gmember, op` erative connections betweenlthe drive shaftl and VWerk-engagingY member, aV ,second housing,

shaft andQWork-engagingj member and enclosing saidjoperative Vconnections between them, a belt-engaging member YslidabV-ly mountedV on t'he first mentioned` housing for movingV the belt longitudinally of said pulley shaft and drive shaft, and meansA on theY second-housing for vbodily moving'` the drive shaft to relieve theabelt -of tension while said belt-engaging member is,

being slidably actuated. Y

Ymounted on the carriage, supporting the V,drive 1f 

